Hi All, currently gutting and renovating a detached house built in 1980. We're putting up internal insulation slabs throughout the house, but does anyone know is there a significant difference between using 62mm v 82mm boards. I'm conscious the bedrooms are quite small and I don't really want to eat into available space. On the other hand, my architect said I'll get a better BER rating by going for the deeper option. Price is an extra €800, but that's not the main issue for me. Anyone have regrets afterwards? I know now is the time to get everything right while the works are ongoing.
